Improvement in looms for weaving slat-blinds



{f 2 Sheets- Sheet I. J. L. DEVOL.

Improvement in Looms for Weaving Slat-Blinds.

No. 127,318, r P'atente dMay 28,1872.

' [mi/e12 for 2 Sheets-Sheet 2 Improvement in Looms for WeavingSlabBlinds. N0, 127,318, Patented May 28.l87-2.,

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- to one another in the ordinary manner.

- batten B oscillates the rock-shaft 0 by means IUNNI'IED STATES PATENTOrrrcn.

IMPROVEMENT IN LOOMS FOR WEAVING SLAT-BLINDS.

Specification formingpart of Letters Patent N 0. 127,318, dated May 28,1872.

Specification describing certain Improvements in Looms, invented byJONATHAN L. DEVOL, of Parkersburg, in the county of Wood and State ofWest Virginia.

This invention relates to looms which are more especially designed forweaving windowshades and such like articles, the woof of which iscomposed of splints of wood. My improvement consists, first, in such anarrangement of the take-up mechanism that the weighted levers whichrotate the cloth-beam intermittingly shall be released for action verysoon after the batten begins to be oscillated forward to drive up thesplint, so that the warpthreads will be kept taut and close upon thesplint, preventing its displacement; secondly, in a novel mechanism forgiving motion to the trea- 'dle which operates the heddle-frames;thirdly, in the employment of a spring by the torsion of which theheddle-frames are prevented from moving upon each other except whenoperated by the treadle; fourth, in an improved mechanism for operatingthe dart which draws the splints through the shed.

Figure lrepresents a side elevation of a loom embodying my improvements.Fig. 2 is a plan view drawn on a smaller scale than Fig. 1. Fig. 3 is afront elevation. Fig. 4 is a rear elevation; and Fig. 5 is a rearelevation of the heddle-frames detached,'both Figs. 4 and 5 being drawnon the same scale as Fig. 2.

The same letters of reference are employed in all the figures in thedesignation of identical parts.

The various parts of the loom are supported upon a suitable frame-work,A A, and the principal members of the machine are all of wellknownconstruction, and arranged in relaai on of connecting-rods B B, whichtake hold of arms or cranks on the rock-shaft. The latter is constructedwith a cam, O, which is recessed in its upper edge, and operates upon aswell on the lever or pedal D, which is pivoted at d in such a mannerthat it may have a slight lateral motion. The free end of theleverextends forward under the downwardly-projecting bars E E of theheddle-frames E E, which are alternately pushed up by the up strokes ofthe lever. The heddle-frames are suspended E with the cam-slot,

for trimming the from a roller overhead, and their bars are connectedtogether by a belt which reeves over a pulley, E arranged beneath thelever B. A portion of the lower end of each bar E is cut away, so thatthe lever may play freely in the space in one, While it operates uponthe foot 6 of the other. These feet e of the bars are of increasingwidth toward their lower termination, where each extends across thelever on the completion of each movement of the heddle-frames, so thatit becomes necessary to give to the bars a slight lateral motion whilebeingmoved vertically, in order that the foot of the descending bar mayclear the ascendin g lever. This lateral motion is obtained by acam-slot, 0 in one of the bars, operating upon a fixed stud, 0 on theother. In descending, the lever slides along the oblique side of thefoot 6; therefrom it is immediately pushed laterally and under such footby the inclined side of the recess in the cam C. To prevent theheddleframes from moving up and down except when operated upon by thelever D, a spring, E is fastened to the stud 0 and firmly held near theother end between studs 0 e on the bar as best seen in Fig. 5. The clothas fast as woven is taken up by the cloth-beam F, which, for thispurpose, is intermittingly rotated by means of weighted levers G Gpivoted to the frame, and provided with pawls g g, which act upon theratchetwheels F F on the ends of the cloth-beam. Other pawls, g g, areused to hold what has been taken up in the ordinary manner. At each backstroke of the batten the weighted leversG are raised to cause theirpawls to advance upon the ratchet-wheels of the clothbeam by oscillatingcams H H, which are pivoted to the batten and oscillated from the armsor cranks on the rock-shaft O by rods H H. The motions of theoscillating cams H in relation to the batten and the heddlle-fram es aresuch that they will escape from under the levers soon after the battenbegins to be thrown forward, and at the moment when the lever D beginsto act upon the heddleframes to change the shed, so that thewarp-threads will be constantly kept taut. The woven fabric is drawnover a cross-beam, I, to which the shears K K,

ends of the splints, are sebut the moment it escapes.

cured. The upper blade of each shear is stationary, with itscutting-edge, which is presented downward, a little distance above theupper surface of the cross-beam I, so that the splints can pass underit. The movable shearblade of each shear is operated from the batten bymeans of connecting-rods K, the operation being such that the bladesopen on the forward stroke of the batten to receive the splint which isbeing driven up, and close on the back stroke to trim off the ends ofthe splint. The prepared splints are fed to the machine through theguide-piece L, and are drawn through the shed by the dart M, which isconstructedwith spring-nippers M for grasping the end of the splint. Thedart slides in i the race N, which is fastened to the batten or reed atthe proper point, and is operated by a cord, m, which is fastened to itat one end first, and, after being wound once or twice around a pulley,0, directly overhead, is passed on and tied to its other end. Upon theface of the pulley O is a smaller pulley, O, which is connected by abelt with the driving-pulley P, mounted upon a shaft in the center ofthe batten. The shaft of the pulley P carries a handle, P, which servesthe double purpose of a hand-piece for oscillating the batten, and of acrank for turning the driving-pulley to throw the dart back and forththrough the shed. The friction of the cords r on the yarnroll R isregulated by shifting the weights r on the levers R, 'to which thebrake-cords are tied near the fulcrums.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with the ratchets F on the cloth-beam F, of theweighted lever G and oscillating cams H, arranged and operatingsubstantially as specified.

2. The combination of the oscillating batten B, connecting-rods B B,rock-shaft G 0, le-

ver D, and bars E e of the heddle-frames E,

which are connected together by a fixed stud, e moving in a cam-slot, 6all the parts being arranged to operate in the manner set forth.

3. The combination of the spring E fastened to the studs 6 with thestuds 6 e, between which it extends, substantially as and for thepurpose set forth.

4. The combination of the dart M, cord m, pulleys O O, driving-pulley P,and handle P all carried by the batten, and operating substantially inthe manner set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' J. L. DEVOL.

Witnesses:

A. RUPPERT, y B. EDW. J. EILS.

